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  • 1
    Monograph available for loan
    Monograph available for loan
    Antarctica and supercontinent evolution (2013)
    London : The Geological Society
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    Call number: 9/M 07.0421(383)
    In: Geological Society special publication
    Description / Table of Contents: Antarctica preserves a rock record that spans three and a half billion years of history and has a remarkable story to tell about the evolution of our Earth, from the hottest crustal rocks yet found in an orogenic system, to the assembly and breakup of Gondwana in the Phanerozoic. This volume highlights our improved understanding of the tectonic events that have shaped Antarctica and how these potentially relate to supercontinent assembly and fragmentation. The internal constitution of the East Antarctic Shield is assessed using information available from the basement geology and from detritus preserved as Mesozoic sediments in the Trans Antarctic Mountains. Accretionary orogenesis along the proto-Pacific margin of Antarctica is examined and the volumes of intracrustal melting compared with juvenile magma additions in these complex orogenic systems assessed. This volume demonstrates the diversity of approaches required to elucidate and understand crustal evolution and evaluate the supercontinent concept.
    Type of Medium: Monograph available for loan
    Pages: 237 S. : z.T. farb. Ill., graph. Darst., Kt.
    ISBN: 9781862393677
    Series Statement: Special Publication / the Geological Society 383
    URL: http://sp.lyellcollection.org/content/383/1
    Classification:
    Lithosphere
    Location: Reading room
    Branch Library: GFZ Library
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  • 2
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    Antarctica and Supercontinent Evolution (2013)
    London : The Geological Society
    Details
    Keywords: Antarctica; Gondwana; supercontinent
    Description / Table of Contents: Antarctica and supercontinent evolution: historical perspectives, recent advances and unresolved issues / Simon L. Harley, Ian C. W. Fitzsimons and Yue Zhao / Geological Society, London, Special Publications, 383, 1-34, 9 October 2013, https://doi.org/10.1144/SP383.9 --- The Mesoproterozoic Rayner Province in the Lambert Glacier area: its age, origin, isotopic structure and implications for Australia–Antarctica correlations / E. V. Mikhalsky, J. W. Sheraton, I. V. Kudriavtsev, S. A. Sergeev, V. P. Kovach, I. A. Kamenev and A. A. Laiba / Geological Society, London, Special Publications, 383, 35-57, 20 May 2013, https://doi.org/10.1144/SP383.1 --- Pb isotopic domains from the Indian Ocean sector of Antarctica: implications for past Antarctica–India connections / M. J. Flowerdew, S. Tyrrell, S. D. Boger, I. C. W. Fitzsimons, S. L. Harley, E. V. Mikhalsky and A. P. M. Vaughan / Geological Society, London, Special Publications, 383, 59-72, 20 May 2013, https://doi.org/10.1144/SP383.3 --- Boron- and phosphate-rich rocks in the Larsemann Hills, Prydz Bay, East Antarctica: tectonic implications / Edward S. Grew, Christopher J. Carson, Andrew G. Christy and Steven D. Boger / Geological Society, London, Special Publications, 383, 73-94, 20 May 2013, https://doi.org/10.1144/SP383.8 --- The c. 1000–900 Ma and c. 550–500 Ma tectonothermal events in the Prince Charles Mountains–Prydz Bay region, East Antarctica, and their relations to supercontinent evolution / Xiaochun Liu, Yue Zhao and Jianmin Hu / Geological Society, London, Special Publications, 383, 95-112, 20 May 2013, https://doi.org/10.1144/SP383.6 --- Contrasting metamorphic records and their implications for tectonic process in the central Sør Rondane Mountains, eastern Dronning Maud Land, East Antarctica / Tatsuro Adachi, Tomokazu Hokada, Yasuhito Osanai, Nobuhiko Nakano, Sotaro Baba and Tsuyoshi Toyoshima / Geological Society, London, Special Publications, 383, 113-133, 13 May 2013, https://doi.org/10.1144/SP383.4 --- Possible armalcolite pseudomorph-bearing garnet–sillimanite gneiss from Skallevikshalsen, Lützow-Holm Complex, East Antarctica: Implications for ultrahigh-temperature metamorphism / Toshisuke Kawasaki, Tatsuro Adachi, Nobuhiko Nakano and Yasuhito Osanai / Geological Society, London, Special Publications, 383, 135-167, 20 May 2013, https://doi.org/10.1144/SP383.2 --- Anatectic reworking and differentiation of continental crust along the active margin of Gondwana: a zircon Hf–O perspective from West Antarctica / Chris Yakymchuk, Christine S. Siddoway, C. Mark Fanning, Rory Mcfadden, Fawna J. Korhonen and Michael Brown / Geological Society, London, Special Publications, 383, 169-210, 18 June 2013, https://doi.org/10.1144/SP383.7 --- Reconstruction of the early Mesozoic plate margin of Gondwana by U–Pb ages of detrital zircons from northern Victoria Land, Antarctica / Martin Elsner, Robert Schöner, Axel Gerdes and Reinhard Gaupp / Geological Society, London, Special Publications, 383, 211-232, 16 May 2013, https://doi.org/10.1144/SP383.5
    Pages: Online-Ressource (237 Seiten) , Illustrationen, Diagramme, Karten
    ISBN: 9781862396470
    URL: https://sp.lyellcollection.org/content/383/1
    Language: English
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  • 3
    Electronic Resource
    Electronic Resource
    Geochronology and geological evolution of metamorphic rocks in the Field Islands area, East Antarctica (1983)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of metamorphic geology 1 (1983), S. 0 
    Details
    ISSN: 1525-1314
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences
    Notes: Detailed geochronological, structural and petrological studies reveal that the geological evolution of the Field Islands area, East Antarctica, was substantially similar to that of the adjacent Archaean Napier Complex, though with notable differences in late and post Archaean times. These differences reflect the area's proximity to the Proterozoic Rayner Complex and consequent vulnerability to tectonic process involved in the formation of the latter. Distinctive structural features of the Field Islands are (1) consistent development of a discordant, pervasive S3 axial-plane foliation; (2) re-orientation of S3 axial planes to approximate to the subsequent E-W tectonic trend of the nearby Rayner Complex; (3) selective retrogression by a post-D3 static thermal overprint; and (4) relatively common development of retrogressive, E-W-trending, mylonitic shear zones.Peak metamorphic conditions in excess of 800°C at 900 ± 100 M Pa (9 kbar) were attained at one locality following, but probably close to the time of D2 folding. D3 took place in late Archaean times when metamorphic temperatures were about 650°C and pressures were about 600 MPa (6 kbar). Later, temperatures of 600 ± 50°C and pressures of 700 MPa (7kbar) were attained in an amphibolite-facies event, presumably associated with the widespread granulite to amphibolite-facies metamorphism and intense deformation involved in the formation of the Rayner Complex at about 1100 Ma. The area was subsequently subjected to near-isothermal uplift.Rb-Sr isotopic data indicate that the pervasive D3 fabric developed at about 2400–2500 Ma, and this age can be further refined to 2456+8-5 Ma by concordant zircon analyses from a syn-D3 pegmatite. All zircons were affected by only minor (〈7–10%) Pb loss and/or new zircon growth during the Rayner event at about 1100Ma. Thus the 450–850 μg/gU concentrations of these zircons were too low to cause sufficient lattice damage over the 1350 Ma (from 2450 Ma) for excessive Pb to be lost during the 1100 Ma event. The emplacement of pegmatite at 522 ± 10 Ma substantially changed the Rb-Sr systematics of the only analysed rock that developed a penetrative fabric during the 1100 Ma event. Monazite in this pegmatite contains an inherited Pb component, which probably resides in small opaque inclusions.A good correlation is found between Rb-Sr total-rock ages and rock fabric. U-Pb zircon intercepts with concordia also mostly correspond to known events. However, in one example a near perfect alignment of zircon analyses, probably developed by mixing of unrelated components, produced concordia intercepts that appear to have no direct geochronological significance.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1525-1314.1983.tb00276.x
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  • 4
    Electronic Resource
    Electronic Resource
    A pyroxene-bearing meta-ironstone and other pyroxene-granulites from Tonagh Island, Enderby Land, Antarctica: further evidence for very high temperature (〉 980°C) Archaean regional metamorphism in the Napier Complex (1987)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of metamorphic geology 5 (1987), S. 0 
    Details
    ISSN: 1525-1314
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences
    Notes: Abstract A suite of granulites including a meta-ironstone, pyroxenites, and spinel-lherzolites from East Tonagh Island, Enderby Land, Antarctica, preserve exsolution-recry-stallization features consistent with a shared metamorphic evolution that involves marked cooling from initial metamorphic temperatures of nearly 1000°C. Reintegrated pre-exsolution and pre-reaction grain compositions in the meta-ironstone indicate the former coexistence of metamorphic pigeonite (Wo12En38Fs50) and ferroaugite (Wo35En31Fs34) at temperatures in excess of 980°C for pressures of 7 kbar (0.7 GPa) using pyroxene quadrilateral thermometry (Lindsley, 1983). Intra-grain lamellae relationships indicate the exsolution of a second pigeonite (Wo12En35Fs53) from the ferroaugite at temperatures in the range 930–970°C, prior to the c. 720–600°C exsolution of orthopyroxene and clinopyroxene (100) lamellae and later partial recrystallization at similar temperatures. Although pyroxenitic and iherzolitic granulites preserve a much less complete history, reintegrated porphyroclast compositions in these yield temperature estimates which approach those inferred from the metaironstone. Pyroxene thermometry based on neoblast compositions suggests that recrystallization post-dating a late, low intensity, deformation phase (D3) occurred at temperatures greater than 600°C. These results are consistent with the independent evidence obtained from studies of metapelitic and felsic rock types for very high temperature metamorphism throughout the Napier Complex followed by near-isobaric cooling and later deformation under lower-grade granulite facies conditions. Comparison with similar pyroxene data from Fyfe Hills (Sandiford & Powell, 1986) demonstrates further the regional significance of these high temperatures, and implies broadly isothermal metamorphic conditions over a large area (∼ 5000 km2) and thickness (6–9 km) of lower crust at c. 3070 Ma.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1525-1314.1987.tb00389.x
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  • 5
    Electronic Resource
    Electronic Resource
    Paragenetic and mineral-chemical relationships in orthoamphibole-bearing gneisses from Enderby Land, east Antarctica: a record of Proterozoic uplift (1985)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of metamorphic geology 3 (1985), S. 0 
    Details
    ISSN: 1525-1314
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences
    Notes: Abstract Polymetamorphic orthoamphibole-bearing gneisses from the vicinity of shear zones in Casey Bay, Enderby Land, Antarctica, record both the overprinting of Archaean granulite lithologies by Proterozoic metamorphism and the subsequent evolution of the latter episode during localized deformation.Mineral chemistry and zoning relationships in orthoamphibole-garnet-kyanite-quartz and later orthoamphibole-garnet-cordierite-quartz assemblages are used together with interpretation of reaction and corona textures to constrain the Proterozoic pressure-temperature path experienced by the rocks. Consideration of reaction topologies, P-T-X(Fe-Mg-A1) relationships in orthoamphibole-bearing assemblages, and standard geothermobarometry indicate that the gneisses underwent a near-isothermal decompression P-T history (steep positive dP/dT) from ± 8 kbar and 700°C to 〈5.5kbar and 650°C. This uplift path is correlated with the general effects of Rayner Complex metamorphism and deformation which occurred after 1100 Ma in a major erogenic belt south of Casey Bay.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1525-1314.1985.tb00313.x
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  • 6
    Electronic Resource
    Electronic Resource
    Reducing mantle redox options (1990)
    [s.l.] : Nature Publishing Group
    Nature 348 (1990), S. 394-394 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] IT is widely accepted that volatile species in the carbon-oxygen-hydrogen system dominate the fluid-present processes in the upper mantle1. The redox state of the mantle controls the fluid speciation and hence the types of magma produced at depth: both the percentage melting at a given pressure and ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/348394a0
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  • 7
    Electronic Resource
    Electronic Resource
    High-temperature granulites (1990)
    [s.l.] : Nature Publishing Group
    Nature 347 (1990), S. 132-133 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] SIR-Hayob et al.' describe exsolved high-temperature ternary feldspars from a granulite xenolith, which they claim to have been produced in a regional-scale deep crustal metamorphism "no more than 30 Myr ago". They also claim that these xenoliths record minimum meta-morphic temperatures that are ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/347132b0
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  • 8
    Electronic Resource
    Electronic Resource
    Origin and growth of continents (1987)
    [s.l.] : Nature Publishing Group
    Nature 329 (1987), S. 108-109 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] IT is widely accepted that the recent growth of continental crust has occurred largely through the accretion of mantle-derived magmas, mainly andesitic, at island arcs or Andean convergent plate margins. At a recent conference*, the overall importance and characteristics of such subduction-related ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/329108a0
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  • 9
    Electronic Resource
    Electronic Resource
    An experimental study of the partitioning of Fe and Mg between garnet and orthopyroxene (1984)
    Springer
    Contributions to mineralogy and petrology 86 (1984), S. 359-373 
    Details
    ISSN: 1432-0967
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract The partitioning of Fe and Mg between garnet and aluminous orthopyroxene has been experimentally investigated in the pressure-temperature range 5–30 kbar and 800–1,200° C in the FeO-MgO-Al2O3-SiO2 (FMAS) and CaO-FeO-MgO-Al2O3-SiO2 (CFMAS) systems. Within the errors of the experimental data, orthopyroxene can be regarded as macroscopically ideal. The effects of Calcium on Fe-Mg partitioning between garnet and orthopyroxene can be attributed to non-ideal Ca-Mg interactions in the garnet, described by the interaction term:W CaMg ga -W CaFe ga =1,400±500 cal/mol site. Reduction of the experimental data, combined with molar volume data for the end-member phases, permits the calibration of a geothermometer which is applicable to garnet peridotites and granulites: $$T(^\circ C) = \left\{ {\frac{{3,740 + 1,400X_{gr}^{ga} + 22.86P(kb)}}{{R\ln K_D + 1.96}}} \right\} - 273$$ with $$K_D = {{\left\{ {\frac{{Fe}}{{Mg}}} \right\}^{ga} } \mathord{\left/ {\vphantom {{\left\{ {\frac{{Fe}}{{Mg}}} \right\}^{ga} } {\left\{ {\frac{{Fe}}{{Mg}}} \right\}}}} \right. \kern-\nulldelimiterspace} {\left\{ {\frac{{Fe}}{{Mg}}} \right\}}}$$ and $$X_{gr}^{ga} = (Ca/Ca + Mg + Fe)^{ga} .$$ The accuracy and precision of this geothermometer are limited by largerelative errors in the experimental and natural-rock data and by the modest absolute variation inK D with temperature. Nevertheless, the geothermometer is shown to yield reasonable temperature estimates for a variety of natural samples.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01187140
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  • 10
    Electronic Resource
    Electronic Resource
    Al zoning in orthopyroxene in a sapphirine quartzite: evidence for 〉1120 °C UHT metamorphism in the Napier Complex, Antarctica, and implications for the entropy of sapphirine (2000)
    Springer
    Contributions to mineralogy and petrology 138 (2000), S. 293-307 
    Details
    ISSN: 1432-0967
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract A unique sapphirine + orthopyroxene + quartz granulite from Mt. Riiser-Larsen in the Tula Mountains of Enderby Land, East Antarctica, preserves two generations of coarse and texturally equilibrated orthopyroxene and sapphirine coexisting with quartz. Initial subhedral orthopyroxene porphyroblasts retain core compositions enriched in Al2O3 (12.2 ± 0.5 wt%) compared with their rims and finer orthopyroxene (9.6 ± 0.5 wt% Al2O3) that forms granoblastic textures with sapphirine. Sapphirine and quartz also form symplectites on and along cleavage planes within orthopyroxene. These compositional and textural features are consistent with the reaction [2MgAl2SiO6=Mg2Al4 SiO10 + SiO2] leading to the formation of sapphirine + quartz at the expense of aluminous orthopyroxene. Calculations in the MAS and FMAS systems and theoretical considerations involving the phases enstatite, sapphirine, sillimanite, quartz and cordierite indicate that the reaction above progresses from left to right with decreasing temperature in the orthopyroxene + sapphirine + quartz field, at pressures of ca. 8–10 kbar. The temperature difference required to account for the ca. 2.5–3 wt% decrease in Al2O3 in orthopyroxene is at least 60–80 °C, and implies peak temperatures for the initial assemblage of at least 1120 °C if the second granoblastic assemblage equilibrated at 1040 °C, the P–T conditions required by the sapphirine + quartz association and other P–T-sensitive assemblage indicators in the Napier Complex. It is not possible to distinguish whether the two assemblages are simply related by cooling and re-equilibration or reflect a polyphase evolution involving the superposition of a second UHT event on an earlier, even higher temperature, UHT metamorphism. Preliminary thermodynamic modelling of the reaction above incorporating the observed range in orthopyroxene Al2O3 zoning indicates that present estimates for the entropy of high-temperature sapphirine are potentially too high by 15–18% compared with sapphirine entropy estimates that are consistent with MAS system experiments. The Mt. Riiser-Larsen sapphirine–quartz rocks preserve the first definitive record of regional metamorphic temperatures in excess of 1120 °C in the Napier Complex, or indeed any UHT granulite terrain worldwide. Similarly high peak temperatures may be retrieved from detailed studies of sapphirine–quartz granulites from other regions, further expanding the thermal realm of crustal metamorphism, but progress will critically depend on the experimental acquisition of new entropy data for sapphirine.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s004100050564
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